Hydrogen and its Compounds - Problem Set
Q. In which of the following compounds does hydrogen act as a Lewis acid?
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A.
H2O
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B.
HCl
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C.
BF3
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D.
H2
Solution
In HCl, hydrogen can act as a Lewis acid by accepting an electron pair.
Correct Answer: B — HCl
Q. What is the coordination number of hydrogen in the complex ion [H2O]2+?
Solution
In the complex ion [H2O]2+, the coordination number of hydrogen is 2.
Correct Answer: B — 2
Q. What is the primary product when hydrogen gas reacts with oxygen gas?
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A.
Water
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B.
Hydrogen peroxide
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C.
Ozone
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D.
Hydrochloric acid
Solution
The primary product of the reaction between hydrogen and oxygen is water (H2O).
Correct Answer: A — Water
Q. What type of bond is formed between hydrogen and chlorine in hydrogen chloride (HCl)?
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A.
Ionic
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B.
Covalent
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C.
Metallic
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D.
Hydrogen
Solution
Hydrogen chloride (HCl) features a covalent bond between hydrogen and chlorine.
Correct Answer: B — Covalent
Q. Which of the following metals can react with water to produce hydrogen gas?
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A.
Gold
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B.
Iron
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C.
Sodium
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D.
Copper
Solution
Sodium reacts vigorously with water to produce hydrogen gas.
Correct Answer: C — Sodium
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